25, slim guy, are there any procedures to get a permanently smaller neck/trapezius? (Photos)

I've had a wide neck/trapezius ever since i was a kid. Im 25 now. Im a slim guy with a wide neck and it looks terrible. There is no fat present in my neck or trapezius area, its all muscle. I dont want botox, as its only temporary. Im looking for a permanent non invasive procedure that can somehow burn or slim down excess muscle in these areas, in order to achieve a normal looking slim neck which would match my body. Thanks